Match the following:
| Names of cells | Functions |
| a. Oxyntic cell | 1. Its function is to secrete mucus for lubricating the food. |
| b. Zymogen cell | 2. Its function is to secrete a proenzyme of protein digestive enzyme. |
| c. Mucous cell | 3. Its function is to secrete hydrochloric acid and activate pepsinogen into the functional pepsin. |
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